Music leaders are biblical and musical instruments are normative, but not mandatory. Psalm 67:1

Active, Attractive, Left Out, Chill Out, Out, Relaxed
For the choir director: with stringed instruments. A psalm. A song.
May God be gracious to us and bless us; may he make his face shine upon us.
-Psalm 67:1

Music leaders are biblical. What matters is their function.

Musical instruments are normative, but not mandatory.

Songs are born singing, are very personal, and fresh; but can be sung with instruments.

Psalms are born by poets and musicians. This one is perhaps both.

Asking for God's grace and blessings towards us is normal for believers.

"Bless us and pour out your grace on us" is right.

The presence of God is the earmark of the people of God.

"Shine upon us" is asking God to turn on the light in our lives, and make us lights that are reflectors of him.
The purpose of the blessing, of his grace bestowed, is to make us reflections of him to those who don't know.

Psalm 67 is a missionary song. Every believer has always been a missionary who longs to see the nations saved. Israel, the people of God then and now, was always meant to be the light of the world, to bring the nations to God.

Selah might mean "pause", or "pause and reflect".

We live in very noisy times, and it's a powerful thing to have silence during worship, between songs, stanzas, or verses.

When we pause, we sense God's presence, and give God the chance to speak, or touch our hearts.
Pause now.